Apparatus for mixing concrete



July 25, 1933. w. A. JAICKS APPARATUS FOR MIXING CONCRETE Filed June 3, 1931 T 0 1C W W I WiZ 672/ 15. Jade/ in the full line positionrotationofqthe'drum Normally the two mixers-are arranged in a Patented .luly 25, 1933 i ll i IT TA ES OF C S i i wILson minions, or amou l l l rPAiz-A'rus MI NG p I Appli eation flled lfune 3,193i sei ie 'ivo. 541,923.

My"invention relates to improvements in merely results in mixing the concrete. W hen apparatus for mixing concrete otthesaine in the dotted line position if the beltconf general type as is shown in my co-pending veyor is operated as it must be,,the material application Ser. No. 523,709 wherein the beingniixed in the'drum,is deposited on batch is partially ni'ixed'in one mixer, then the) belt conveyor and fed forwardly into discharging therefrom 5 inan incompletely the drumf and in view of theiactdthat mixed condition and thereafter charged into the'drum-is rotating only a very few seconds a second mixer which further mixes the conelapsesfromthe time that the belt conve or crete and which may thereafter discharge is IIIOVQCllIllZO the drum to the timew en concrete either to another mixer, to a storthe entire contents of the drum have been ageor conveying zone or member or directly deposited on the belt conveyor and carried to the work as the case maybe. Other 010- away by it. 1 I

jects will appear from timeto time througho. Zmixeris at the right. It comprises;

out the specification and claims. a drum B driven by motor 13 supported c My invention is illustrated in the accom, bylnotor driven rollers B fromthe platpanying drawing, wherein form B projecting toward the rear. It car- Figure 1 is a side elevation ot'gthe preries a fixedladder B on' which ism ounted ferred form of my device; 1 a belt conveyor B which belt conveyor "dis Figure 2 is a detail side elevation of a charges by'nieans of the chute B into the 29 modified form; drum B. The movable tie .bars Bfjoin the.-

Figure 3 is a plan view of the device platforms A and B into fixed relation with shown in Figure 2; I the belt conveyorfBf'beneath' and adapted Figure .4 is a section along the line 4% to receive the discharge from thebeltconof Figure 2. F y I veyor A so that concrete discharged from 25 Like parts are indicated by like charactll drum A ay e g y t e be t 0011'- ters throughout the specification and drawveyor A conveyed by it and discharged to i n; i the conveyor .B -Which in turnfeedsit to Fumber 1 mixer is shown on the left. It the drum B. The belt conveyOrB is driven comprises a mixing drum A driven by me from the motor 'B bymeans of the belt B 1 tor A supported by means of driving r'oll- The belt conveyor AF is driven from the mo;

. er s'A on the platform A which in turn is tor B? by means of the belt PER-"When the supported on the crawler running gear A belt conveyor A is withdrawn from'th'e which may also be driven and controlled drum A the belt B remains slack as indif m th ot A by y suitable convencalled and doesnot transmit power. When;

35 tional means, the details of which are not the conveyor A is thrown into the drunrA here shown. The unmixed concrete consistlocated in position by any-suitable means, I ing of sand, gravel and crushed rock, cethe belt B is tight and causes operation'of ment and water is placed in'drum A, the the belt conveyor- A j i f chute A providing a convenient means for The tierod B constrains the two mixers I U i 40 inducing the aggregate. Extending for- 'into'a position such thjat the belt conveyors wardly away from the discharge end ofthe are in proper working relation onewith the drum A is a supporting framework A hav= "other. 1 Under some circumstances, however, ing a track A upon which is mounted a the tie bars maybe omittedand in this case belt conveyor ladder A which ladder is prothe moving and positioning of the two mix- 45 vided with rollers A adapted to travelalong ers becomes slightly more difiicult and'the the track A so that the la'dder'ma'y either operator must manipulate them more-"carebe moved out into the inoperative; position fully to insure that they are spotted in shown in full lines or in into the opera-. proper relation to permit the belt conveyor tive position shown in dotted lines. When A to discharge onto thebelt conveyor "Bi of the finished concrete and supply of the a. In the, modified 2, 3 and 4,

' v will no longer line parallel with the axis of the road or work. Under some circumstances,however, they might be differently related out of line. Their axes might be parallel or inclined, they might be perpendicular to each other, they might beldistinctly out of line or ar ranged in any way suitable and convenient for manipulation of the mixers, discharge raw'material, it being only necessary that they be so related that the belt conveyor or other convenient means from mixer No.1

5 posev no limitations on the relative positions ofjthe two mixers. 1

forms shown in Figures C is a fixed belt conveyor ladder. It is driven from the shaft, which carries therellers A? byfmeans of a bevel gear and shaft power system C to the shaft C which by, meansvof a sprocket chain C drives the belt, In thifsfcase thejla'dder and the belt conveyor always project into drum No. 1. ,As long as the shield C on itsrollers C is located inside thedrum as indicated on Fig ure 2, the material as it is picked up by the flrum'or by theblades in the drum, car

fall, will strike the shield andfislide on'it so as not to be deposited onto the,belt" conveyor. If the shield is drawn to the left into the dotted line position, it .protectthe belt conveyor and the f concrete will ,be. droppedtonto the belt conveyor and by it discharged'to drum No;

up, anc1 allowed to It willgbe understood, of course ,in' operating'the device, the raw materials including water are introduced into mixer No. '1 and there mixed for a length of time less than the total mixing time,then discharged fronrmi'xer No. 1 into the conveying apparatus and by it conveyed to mixer No. 2, where either the concretev may stay long enough to complete itsimixin g or may stay a length of time less than the total mixing time required, in which latter case, material willbe taken from drum No. 2 to some other suitable point;for further treatment either by means of a third drum or other suitable apparatus. j j

The relation between the capacity of the mixer, the rate at which material is dis charged from the mixer, the capacity of the conveyor and the rate at which the material is discharged from the conveyor must be such that as soon as the conveyor is brought into'working relation with drum No. 1, it carries the mixed material away from that drum as fast as the drum discharges it so that the discharge from the drum causes no delay in the cycle of operation. Normally this lengthof'time is only a few seconds. The. material discharged from the drum carried by the belt conveyor will im-. mediately under ordinary conditions be discharged into the second drum. The "belt conveyor 1nay be so long that the entire batch maybe dischargedv into the belt conveyor system before it starts to be fed onto the second drum or it may be so short that thesecond drum begins to receive the partially mixed material before the first drum has finisheddischarging but in either event the operation must be so timed that as soon as the materialhas been discharged from drum No. 2, material from drum No. 1 will c'ommence to reach drum No. 2 and as soon asmaterial has been discharged from drum No. 1, raw material will begin to be added to it but there must bejno overlap. It'is necessary; that all the material be out of drum No. 1 before any new material is put in, and all the material be put out of drum 1 No. 2 before any new material is put in.

Iclaim: r v 1. A concrete mixing apparatus compris- I ing a plurality of mixing drums, separate supporting and operating means therefor, a

belt conveyor system interposed. between them comprising a separate framework mounted on'e ach drum supporting means, a

separate belt conveyor mounted on each framework,- one belt conveyor adapted to receive material from the first drum and'discharge it to the other conveyor, which'conveyor discharges material to the second drum, the first conveyor being movable asa unit along a generally horizontal p athftoward and from the first drum whereby when moved towardthe drum it projects there into and is adapted to receive material, drive means for said conve ors mounted on the support for the secon drum, and a discontinuous driving connection between thefirst conveyor'and the drive means and means for causing its operation when the first conveyor is projected into its associated" drum. '2. A concrete mixing apparatuscomprising a plurality of mixing drums, separate supporting and operating means therefor, a belt'conveyor system interposed between them comprising a separate framework mounted on each drum supporting means, a separate ;belt conveyor mounted on each, framework, one belt conveyor adapted to'rec'eive material from the first drum and discharge it to the other conveyor, which conveyor' discharges 'material" to "the second ward and from the first drum whereby when moved toward the drum, it projects thereinto and is ada ted to receive material, drive means for sai conveyors mounted on the support for the second drum, and a dlscontinuous driving connection between the first,

conveyor and the drive means, operative only when the first conveyor is projected into "its associated drum, the driving means for said first conveyor including a belt, a pulley carried by the supporting'means for the second drum, a pulley associated with the'fir st conveyor, the belt being adapted to beloose and so have no driving eflect whenthe conveyor is out of register with the drum but to be tight and drive thec'onve'yor'when the conveyor is in the drum and simultaneously to limit the inward excursion of the conveyor toward the drum. 3. A concrete mixing apparatus comprising a plurality of mixing drums, separate.

supporting and operating means therefor, a belt conveyor system interposed between mounted on each drum supporting means, a.

separate belt conveyor mounted on each them comprising a separate framework framework, one belt conveyor adapted to receive material from'the first drum and tinuous driving connection between the first conveyor and the drive means operative support for the second drum, and a discononly when the first conveyor is projected" into its associated drum, the capacity of the belt conveyor system being such that it can receive and hold at one time the entire contents of the first drum. i a H "WILSON A. JAIOKS. 3 

